It seems like compatibility could be maintained by managing the transition like this:
(1) new repoman writes both the digests and new-style manifest. Of course, this is redundant, but that's ok... it's all about transition. (2) new portage uses rsync exclusions to ignore the digests since it only needs the new-style manifest: rsync --exclude '**/files/digest*' --delete-excluded (3) users get immediate benefit. we can keep running in this mode as long as necessary before completely deprecating the digest files -- Aron Griffis Gentoo Linux Developer
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